Comments on: The real Claremont cherthttps://oaklandgeology.wordpress.com/2008/09/07/the-real-claremont-chert/
focused on, near and under Oakland, CaliforniaThu, 08 Dec 2016 20:26:45 +0000hourly1http://wordpress.com/By: Davehttps://oaklandgeology.wordpress.com/2008/09/07/the-real-claremont-chert/#comment-1516
Sun, 01 Aug 2010 15:19:45 +0000http://oaklandgeology.wordpress.com/?p=227#comment-1516Hi Guys,
Been a while, but I wanted you to know that my son and his partners got an A on the science project. It was a lot of work at the end to pull it all together (6th graders, go figure). They had to give a presentation about it that we didn’t realize until the morning of, but since I wanted them to do the work and understand what they were doing they were able to explain it well.

My son has had his fill, but I’m still interested in this stuff. Keep the posts coming. Nice to know what we have in the area and to be able to identify it.

Dave

]]>By: Andrewhttps://oaklandgeology.wordpress.com/2008/09/07/the-real-claremont-chert/#comment-1433
Fri, 14 May 2010 15:52:15 +0000http://oaklandgeology.wordpress.com/?p=227#comment-1433Jim, I took my cue from Russ Graymer’s geologic map of the Oakland area (MF-2342), where he refers to “the formally accepted name Claremont Shale” citing Lawson 1914. Adding to the confusion is that the Claremont is actually a local piece of the enormous Monterey Formation.

As for blueschist, we do have it in Oakland. But I’m hoping to find lawsonite in large enough grains to identify it without a thin section, not having my own pet mike.

]]>By: Jimhttps://oaklandgeology.wordpress.com/2008/09/07/the-real-claremont-chert/#comment-1432
Fri, 14 May 2010 10:07:36 +0000http://oaklandgeology.wordpress.com/?p=227#comment-1432Forgot one thing. Your best best for Lawsonite is not in the east bay. It is almost always associated with the blueschist facies of metamorphic rock along with glaucophane. Although it does occur as a altered mineral in Gabbros and diorites, but that is much less common. Good luck finding it. Its cool looking stuff in thin section.